Texas Instruments INA296A2IDGKR

Overview

INA296A2IDGKR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for 48V systems, featuring 20V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±10µV max input offset voltage. It enables high-accuracy DC and transient current monitoring in high-voltage power conversion stages such as 48V DC/DC converters and battery management systems.

For engineers reviewing the INA296A2IDGKR datasheet, INA296A2IDGKR pinout, INA296A2IDGKR application, or INA296A2IDGKR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions for VSSOP-8 layout, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The INA296A2IDGKR uses a zero-drift, precision current-sense architecture that maintains ±10µV max offset and ±0.01% max gain error across −40°C to +125°C, enabling accurate low-V_SENSE measurement down to millivolt levels. Its input bias current remains constant at 35µA (typ) over the full −20V to 120V survival common-mode range - independent of V_CM - unlike conventional high-voltage amplifiers.

It supports configurable unidirectional or bidirectional operation via dual reference pins (REF1/REF2), allowing output centering at mid-supply (e.g., 2.5V on 5V rail) for symmetric current sensing. The 8V/µs slew rate and 1µs 1% settling time enable fast overcurrent detection in transient-critical applications like macro RRU protection and server PSU fault response.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK), 3mm × 4.9mm body, exposed thermal pad (not electrically connected), RoHS-compliant, rated for −40°C to +125°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA296A2IDGKR, INA240A2IDR trades 30V common-mode headroom and 700kHz bandwidth for lower cost and broader distributor availability, while MAX40056ATA+T sacrifices 45V common-mode margin and adds assembly complexity to achieve marginally higher bandwidth in ultra-compact form factor.

Availability

INA296A2IDGKR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems, and macro remote radio units requiring stable component supply, long-lifecycle support, and guaranteed traceability for industrial and telecom deployments.

Supply support for INA296A2IDGKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and high-reliability power management ICs.

The INA296x product line was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - including datacenter PSUs, EV charging infrastructure, and 5G telecom equipment - where accuracy, speed, and voltage range are simultaneously critical.

FAQ

What is the maximum common-mode voltage the INA296A2IDGKR can withstand continuously?

The INA296A2IDGKR operates continuously over −5V to 110V common-mode input range. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond operational limits without damage - critical for 48V systems exposed to load-dump or inductive kick events. This rating applies directly to the INA296A2IDGKR in VSSOP-8 package under recommended operating conditions.

How does the INA296A2IDGKR achieve bidirectional current sensing without external components?

The INA296A2IDGKR achieves true bidirectional sensing using its dual reference inputs (REF1 and REF2). By biasing REF1 to VS and REF2 to GND, the output centers at VS/2 - enabling positive current to drive output above VS/2 and negative current to drive it below. This internal reference divider eliminates external op-amps or resistive networks required by legacy amplifiers, simplifying design for the INA296A2IDGKR in BMS and RRU applications.

What is the typical input bias current of the INA296A2IDGKR, and why does it matter for shunt selection?

The INA296A2IDGKR has a typical input bias current of 35µA per input, constant across its full −20V to 120V common-mode range. This matters because low-bias-current operation prevents voltage error across high-value shunts (e.g., 1Ω for low-current sensing), preserving measurement accuracy. For the INA296A2IDGKR, this enables use of higher-resistance shunts without introducing significant offset - unlike competing amplifiers whose bias current scales with V_CM.

Can the INA296A2IDGKR be used in low-side current sensing configurations?

Yes, the INA296A2IDGKR supports low-side, high-side, and inline current sensing. In low-side configuration, connect IN+ to the load side of the shunt and IN− to ground. Its −5V to 110V common-mode range accommodates ground-referenced sensing even with negative rail excursions, and its 166dB CMRR rejects noise from shared ground paths. This capability is fully specified for the INA296A2IDGKR across temperature and supply variations.

What is the output voltage swing limitation of the INA296A2IDGKR at 125°C?

At 125°C and with 10kΩ load to ground, the INA296A2IDGKR output swings from as low as 20mV above GND to as high as VS − 70mV. This rail-to-rail capability ensures full-scale utilization of ADC input ranges in hot environments - for example, delivering 0.02V–4.93V output on a 5V supply. These limits are guaranteed for the INA296A2IDGKR in VSSOP-8 package per TI's SBOSA04D datasheet revision December 2024.